Maya Rudolph, Glenn Howerton set for 'Family Guy' |

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'Family Guy': Maya Rudolph and Glenn Howerton to guest in episode -- EXCLUSIVE

Maya Rudolph Glenn Howerton

(Jason Merritt/Getty Images; Mark Davis/Getty Images)

Family Guy has recruited two familiar TV voices for an upcoming episode, and those voices belong to Maya Rudolph and Glenn Howerton. Rudolph, a veteran of SNL and Up All Night, will assume the role of an avid runner who catches Brian’s eye. To win her over, he pretends to be a fellow jogger. “After Brian experiences the ‘runner’s high’, he becomes a distance running douche, and even signs himself up to run a marathon,” Family Guy executive producer Steve Callaghan tells EW.

Meanwhile, Howerton, star/writer/executive producer of It’s Always Sunny in Philadelphia, voices the publisher of a children’s book that Joe has been toiling on. “After Peter gets a glimpse of Joe’s book, he encourages Joe to try to get it published,” says Callaghan. “And before he knows it, Joe is a famous children’s book author.”

The Rudolph-Howerton episode is tentatively slated to air next fall on Fox.

Other celebrities on the animated comedy’s guest roster this season include Michelle Dockery, Conan O’Brien and Jeff Daniels.